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rule Careto {
meta:
author = "AlienVault (Alberto Ortega)"
description = "TheMask / Careto generic malware signature"
reference = "www.securelist.com/en/downloads/vlpdfs/unveilingthemask_v1.0.pdf"
strings:
/* General */
$name1 = "Careto" ascii wide
$s_1 = "GetSystemReport" ascii wide
$s_2 = "SystemReport.txt" ascii wide
$s_3 = /URL_AUX\w*=/ ascii wide
$s_4 = /CaretoPruebas.+release/
/* Certificate */
$sign_0 = "Sofia"
$sign_1 = "TecSystem Ltd"
$sign_2 = "<<<Obsolete>>>" wide
/* Encryption keys */
$rc4_1 = "!$7be&.Kaw-12[}" ascii wide
$rc4_2 = "Caguen1aMar" ascii wide
/* http://laboratorio.blogs.hispasec.com/2014/02/analisis-del-algoritmo-de-descifrado.html */
$rc4_3 = {8d 85 86 8a 8f 80 88 83 8d 82 88 85 86 8f 8f 87 8d 82 83 82 8c 8e 83 8d 89 82 86 87 82 83 83 81}
/* Decryption routine fragment */
$dec_1 = {8b 4d 08 0f be 04 59 0f be 4c 59 01 2b c7 c1 e0 04 2b cf 0b c1 50 8d 85 f0 fe ff ff}
$dec_2 = {8b 4d f8 8b 16 88 04 11 8b 06 41 89 4d f8 c6 04 01 00 43 3b 5d fc}
condition:
$name1 and (any of ($s_*)) or all of ($sign_*) or any of ($rc4_*) or all of ($dec_*)
}
rule Careto_SGH {
meta:
author = "AlienVault (Alberto Ortega)"
description = "TheMask / Careto SGH component signature"
reference = "www.securelist.com/en/downloads/vlpdfs/unveilingthemask_v1.0.pdf"
strings:
$m1 = "PGPsdkDriver" ascii wide fullword
$m2 = "jpeg1x32" ascii wide fullword
$m3 = "SkypeIE6Plugin" ascii wide fullword
$m4 = "CDllUninstall" ascii wide fullword
condition:
2 of them
}
rule Careto_OSX_SBD {
meta:
author = "AlienVault (Alberto Ortega)"
description = "TheMask / Careto OSX component signature"
reference = "www.securelist.com/en/downloads/vlpdfs/unveilingthemask_v1.0.pdf"
strings:
/* XORed "/dev/null strdup() setuid(geteuid())" */
$1 = {FF 16 64 0A 7E 1A 63 4D 21 4D 3E 1E 60 0F 7C 1A 65 0F 74 0B 3E 1C 7F 12}
condition:
all of them
}
rule Careto_CnC {
meta:
author = "AlienVault (Alberto Ortega)"
description = "TheMask / Careto CnC communication signature"
reference = "www.securelist.com/en/downloads/vlpdfs/unveilingthemask_v1.0.pdf"
strings:
$1 = "cgi-bin/commcgi.cgi" ascii wide
$2 = "Group" ascii wide
$3 = "Install" ascii wide
$4 = "Bn" ascii wide
condition:
all of them
}
rule Careto_CnC_domains {
meta:
author = "AlienVault (Alberto Ortega)"
description = "TheMask / Careto known command and control domains"
reference = "www.securelist.com/en/downloads/vlpdfs/unveilingthemask_v1.0.pdf"
strings:
$1 = "linkconf.net" ascii wide nocase
$2 = "redirserver.net" ascii wide nocase
$3 = "swupdt.com" ascii wide nocase
condition:
any of them
}
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